One difference from the 1.51 Beta is that we had to go back to using Spout 1.6 because we detected a performance drop in Spout 2.0. We'll be investigating this further for the next Magic release. If you're actively using the Spout output functionality, you should definitely update to the full Magic 1.51 release.

Also, we've made a minor improvement to the Magic installers: they now detect previous versions of Magic. On Windows in particular, you'll be given the option to uninstall the existing version. This is generally recommended, because overwriting the previous installation can result in some minor compatibility issues.

Don't worry -- your preferences and activation status will never be affected when you uninstall previous versions. This is true for both Windows and OS X.